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                    updateFunctionalComponent
            
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                    updateHostRoot
            
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                    updateHostText
            
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                    updateSuspenseComponent
            
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                    updatePortalComponent
            
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                    updateContextConsumer
            
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                    调和列表
            
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                    commit 阶段
            
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                    invokeGuardedCallback
            
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                    commitBeforeMutationLifecycles
            
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                    commitPlacement
            
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                    commitAllLifecycle
            
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                    Suspense
            
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                    挂起任务的含义
            
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                    lazy 组件
            
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                    Hooks
            
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                    useEffect
            
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                                <div class="api-method"><div class="api-method-definition"><h1 id="reconcilechildrenarray">reconcileChildrenArray</h1><p>&#x5728;<code>beginWork</code>&#x9636;&#x6BB5;&#xFF0C;<code>updateHostComponent</code>&#x7684;&#x65F6;&#x5019;&#x4F1A;&#x6267;&#x884C;<code>reconcileChildFibers</code>&#x6216;&#x8005;<code>mountChildFibers</code>(&#x521D;&#x59CB;&#x5316;&#x7684;&#x65F6;&#x5019;)&#xFF0C;&#x8FD9;&#x4E24;&#x4E2A;&#x65B9;&#x6CD5;&#x5176;&#x5B9E;&#x662F;&#x4E00;&#x6837;&#x7684;&#xFF0C;&#x552F;&#x4E00;&#x4E0D;&#x540C;&#x662F;&#x53C8;&#x4E00;&#x4E2A;&#x5168;&#x5C40;&#x53D8;&#x91CF;&#x4E0D;&#x4E00;&#x6837;&#xFF1A;<code>shouldTrackSideEffects</code>&#x3002;</p><ul><li><code>reconcileChildFibers</code>&#x7684;&#x65F6;&#x5019;&#x662F;<code>true</code>
</li>
<li><code>mountChildFibers</code>&#x7684;&#x65F6;&#x5019;&#x662F;<code>false</code>
</li></ul>
<p>&#x7136;&#x540E;&#x5982;&#x679C;&#x53D1;&#x73B0;<code>newChild</code>&#x662F;&#x6570;&#x7EC4;&#xFF0C;&#x90A3;&#x4E48;&#x5C31;&#x662F;&#x6267;&#x884C;<code>reconcileChildrenArray</code>&#xFF0C;&#x90A3;&#x4E48;&#x8FD9;&#x65F6;&#x5019;<code>key</code>&#x5C31;&#x53EF;&#x4EE5;&#x53D1;&#x6325;&#x4F5C;&#x7528;&#x3002;&#x63A5;&#x4E0B;&#x53BB;&#x6211;&#x4EEC;&#x5C31;&#x6765;&#x89E3;&#x6790;&#x4E00;&#x4E0B;&#x8FD9;&#x4E2A;&#x51FD;&#x6570;</p><p>&#x9996;&#x5148;&#x8FDB;&#x884C;&#x4E0D;&#x6B63;&#x786E;&#x7684;<code>key</code>&#x7684;&#x8B66;&#x544A;&#xFF0C;&#x7136;&#x540E;&#x58F0;&#x660E;&#x4E86;&#x4E00;&#x5806;&#x53D8;&#x91CF;&#xFF0C;&#x770B;&#x540D;&#x5B57;&#x5C31;&#x5927;&#x81F4;&#x80FD;&#x77E5;&#x9053;&#x610F;&#x601D;&#xFF0C;&#x7136;&#x540E;&#x8FDB;&#x5165;&#x4E00;&#x4E2A;&#x5FAA;&#x73AF;&#xFF0C;&#x5728;&#x5FAA;&#x73AF;&#x91CC;&#x9762;&#x8C03;&#x7528;&#x4E86;<code>updateSlot</code>&#xFF0C;&#x4E0B;&#x4E00;&#x4E2A;&#x533A;&#x5757;&#x4F1A;&#x8BE6;&#x7EC6;&#x8BB2;&#x89E3;&#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x8FD9;&#x91CC;&#x6211;&#x4EEC;&#x53EA;&#x9700;&#x8981;&#x77E5;&#x9053;&#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#x5BF9;&#x6BD4;&#x65B0;&#x65E7;<code>children</code>&#x76F8;&#x540C;<code>index</code>&#x7684;&#x5BF9;&#x8C61;&#x7684;<code>key</code>&#x662F;&#x5426;&#x76F8;&#x7B49;&#xFF0C;&#x5982;&#x679C;&#x662F;&#xFF0C;&#x8FD4;&#x56DE;&#x8BE5;&#x5BF9;&#x8C61;&#xFF0C;&#x5982;&#x679C;&#x4E0D;&#x662F;&#xFF0C;&#x8FD4;&#x56DE;<code>null</code>&#x3002;&#x4E5F;&#x5C31;&#x662F;&#x9010;&#x4E2A;&#x5BF9;&#x6BD4;&#x4E24;&#x4E2A;&#x6570;&#x7EC4;&#xFF0C;&#x5982;&#x679C;&#x76F8;&#x7B49;&#x5219;&#x7EE7;&#x7EED;&#xFF0C;&#x5982;&#x679C;&#x6709;&#x4EFB;&#x4F55;&#x4E00;&#x4E2A;&#x4E0D;&#x7B49;&#xFF0C;&#x90A3;&#x4E48;&#x8DF3;&#x51FA;&#x5FAA;&#x73AF;&#x3002;</p><p>&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#x8FD9;&#x4E2A;&#x5FAA;&#x73AF;&#x627E;&#x5230;&#x4E86;&#x7B2C;&#x4E00;&#x4E2A;&#x4E0D;&#x60F3;&#x7B49;&#x7684;&#x4F4D;&#x5B50;&#xFF0C;&#x8FD9;&#x4E2A;&#x65F6;&#x5019;<code>oldFiber</code>&#x5C31;&#x662F;&#x90A3;&#x4E2A;&#x4E0D;&#x7B49;&#x7684;</p><pre><code class="lang-js"><span class="hljs-keyword">if</span> (newIdx === newChildren.length) {
  deleteRemainingChildren(returnFiber, oldFiber)
  <span class="hljs-keyword">return</span> resultingFirstChild
}</code></pre>
<p>&#x5982;&#x679C;&#x5FAA;&#x73AF;&#x4E4B;&#x540E;&#xFF0C;&#x5FAA;&#x73AF;&#x957F;&#x5EA6;&#x548C;&#x65B0;&#x7684;<code>children</code>&#x7684;&#x957F;&#x5EA6;&#x76F8;&#x7B49;&#xFF0C;&#x8BF4;&#x660E;&#x65B0;&#x7684;&#x6570;&#x7EC4;&#x53EF;&#x80FD;<strong>&#x5C0F;&#x4E8E;&#x7B49;&#x4E8E;</strong>&#x8001;&#x6570;&#x7EC4;&#xFF0C;&#x90A3;&#x4E48;&#x6709;&#x53EF;&#x80FD;&#x8001;&#x6570;&#x7EC4;&#x540E;&#x9762;&#x6709;&#x5269;&#x4F59;&#x7684;&#xFF0C;&#x6240;&#x4EE5;&#x8981;&#x5220;&#x9664;&#x3002;</p><pre><code class="lang-js"><span class="hljs-keyword">if</span> (oldFiber === <span class="hljs-literal">null</span>) {
  <span class="hljs-keyword">for</span> (; newIdx &lt; newChildren.length; newIdx++) {
    <span class="hljs-keyword">const</span> newFiber = createChild(
      returnFiber,
      newChildren[newIdx],
      expirationTime,
    )
    <span class="hljs-keyword">if</span> (!newFiber) {
      <span class="hljs-keyword">continue</span>
    }
    lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx)
    <span class="hljs-keyword">if</span> (previousNewFiber === <span class="hljs-literal">null</span>) {
      resultingFirstChild = newFiber
    } <span class="hljs-keyword">else</span> {
      previousNewFiber.sibling = newFiber
    }
    previousNewFiber = newFiber
  }
  <span class="hljs-keyword">return</span> resultingFirstChild
}</code></pre>
<p>&#x5982;&#x679C;&#x5FAA;&#x73AF;&#x4E4B;&#x540E;&#x6CA1;&#x6709;<code>oldFiber</code>&#x4E5F;&#x5C31;&#x662F;&#x6240;&#x6709;&#x8001;&#x7684;&#x6570;&#x7EC4;&#x90FD;&#x53EF;&#x4EE5;&#x590D;&#x7528;&#xFF0C;&#x800C;&#x5269;&#x4F59;&#x7684;&#x65B0;&#x6570;&#x7EC4;&#x7684;&#x9879;&#x5C31;&#x53EF;&#x4EE5;&#x4F5C;&#x4E3A;&#x65B0;&#x7684;&#x9879;&#x76F4;&#x63A5;&#x63D2;&#x5165;&#x8FDB;&#x53BB;&#x4E86;&#x3002;</p><p>&#x6700;&#x540E;&#x5982;&#x679C;&#x4E0A;&#x9762;&#x4E24;&#x79CD;&#x60C5;&#x51B5;&#x90FD;&#x4E0D;&#x7B26;&#x5408;&#xFF0C;&#x5219;&#x4EE3;&#x8868;&#x6709;&#x53EF;&#x80FD;&#x987A;&#x5E8F;&#x6362;&#x4E86;&#x6216;&#x8005;&#x6709;&#x65B0;&#x589E;&#x6216;&#x5220;&#x51CF;&#xFF0C;&#x6240;&#x4EE5;&#x5C31;&#x521B;&#x5EFA;&#x4E00;&#x4E2A;<code>existingChildren</code>&#x4EE3;&#x8868;&#x6240;&#x6709;&#x5269;&#x4F59;&#x6CA1;&#x6709;&#x5339;&#x914D;&#x6389;&#x7684;&#x8282;&#x70B9;&#xFF0C;&#x7136;&#x540E;&#x65B0;&#x7684;&#x6570;&#x7EC4;&#x6839;&#x636E;<code>key</code>&#x4ECE;&#x8FD9;&#x4E2A; map &#x91CC;&#x9762;&#x67E5;&#x627E;&#xFF0C;&#x5982;&#x679C;&#x6709;&#x5219;&#x590D;&#x7528;&#xFF0C;&#x6CA1;&#x6709;&#x5219;&#x65B0;&#x5EFA;&#x3002;</p><p>&#x6700;&#x540E;&#x8001;&#x7684;&#x6CA1;&#x6709;&#x5339;&#x914D;&#x5230;&#x7684;&#x90FD;&#x8981;&#x5220;&#x9664;&#x3002;</p><p><strong>&#x53EF;&#x4EE5;&#x770B;&#x5230;<code>key</code>&#x7684;&#x4F5C;&#x7528;&#x4E3B;&#x8981;&#x5C31;&#x662F;&#x590D;&#x7528;&#x4E4B;&#x524D;&#x7684;&#x8282;&#x70B9;&#x7684;&#xFF0C;&#x6CA1;&#x6709;<code>key</code>&#x7684;&#x8BDD;&#xFF0C;&#x6570;&#x7EC4;&#x5C31;&#x8981;&#x6BCF;&#x6B21;&#x5168;&#x90E8;&#x5220;&#x9664;&#x7136;&#x540E;&#x91CD;&#x65B0;&#x521B;&#x5EFA;&#xFF0C;&#x5F00;&#x9500;&#x5C31;&#x975E;&#x5E38;&#x5927;</strong></p></div><div class="api-method-code"><div class="api-method-sample" data-lang="js" data-name="JavaScript"><pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">reconcileChildrenArray</span>(<span class="hljs-params">
  returnFiber: Fiber,
  currentFirstChild: Fiber | null,
  newChildren: Array&lt;*&gt;,
  expirationTime: ExpirationTime,
</span>): <span class="hljs-title">Fiber</span> | <span class="hljs-title">null</span> </span>{
  <span class="hljs-keyword">if</span> (__DEV__) {
    <span class="hljs-comment">// First, validate keys.</span>
    <span class="hljs-keyword">let</span> knownKeys = <span class="hljs-literal">null</span>
    <span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> i = <span class="hljs-number">0</span>; i &lt; newChildren.length; i++) {
      <span class="hljs-keyword">const</span> child = newChildren[i]
      knownKeys = warnOnInvalidKey(child, knownKeys)
    }
  }

  <span class="hljs-keyword">let</span> resultingFirstChild: Fiber | <span class="hljs-literal">null</span> = <span class="hljs-literal">null</span>
  <span class="hljs-keyword">let</span> previousNewFiber: Fiber | <span class="hljs-literal">null</span> = <span class="hljs-literal">null</span>

  <span class="hljs-keyword">let</span> oldFiber = currentFirstChild
  <span class="hljs-keyword">let</span> lastPlacedIndex = <span class="hljs-number">0</span>
  <span class="hljs-keyword">let</span> newIdx = <span class="hljs-number">0</span>
  <span class="hljs-keyword">let</span> nextOldFiber = <span class="hljs-literal">null</span>
  <span class="hljs-keyword">for</span> (; oldFiber !== <span class="hljs-literal">null</span> &amp;&amp; newIdx &lt; newChildren.length; newIdx++) {
    <span class="hljs-keyword">if</span> (oldFiber.index &gt; newIdx) {
      nextOldFiber = oldFiber
      oldFiber = <span class="hljs-literal">null</span>
    } <span class="hljs-keyword">else</span> {
      nextOldFiber = oldFiber.sibling
    }
    <span class="hljs-keyword">const</span> newFiber = updateSlot(
      returnFiber,
      oldFiber,
      newChildren[newIdx],
      expirationTime,
    )
    <span class="hljs-keyword">if</span> (newFiber === <span class="hljs-literal">null</span>) {
      <span class="hljs-keyword">if</span> (oldFiber === <span class="hljs-literal">null</span>) {
        oldFiber = nextOldFiber
      }
      <span class="hljs-keyword">break</span>
    }
    <span class="hljs-keyword">if</span> (shouldTrackSideEffects) {
      <span class="hljs-keyword">if</span> (oldFiber &amp;&amp; newFiber.alternate === <span class="hljs-literal">null</span>) {
        deleteChild(returnFiber, oldFiber)
      }
    }
    lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx)
    <span class="hljs-keyword">if</span> (previousNewFiber === <span class="hljs-literal">null</span>) {
      resultingFirstChild = newFiber
    } <span class="hljs-keyword">else</span> {
      previousNewFiber.sibling = newFiber
    }
    previousNewFiber = newFiber
    oldFiber = nextOldFiber
  }

  <span class="hljs-keyword">if</span> (newIdx === newChildren.length) {
    deleteRemainingChildren(returnFiber, oldFiber)
    <span class="hljs-keyword">return</span> resultingFirstChild
  }

  <span class="hljs-keyword">if</span> (oldFiber === <span class="hljs-literal">null</span>) {
    <span class="hljs-keyword">for</span> (; newIdx &lt; newChildren.length; newIdx++) {
      <span class="hljs-keyword">const</span> newFiber = createChild(
        returnFiber,
        newChildren[newIdx],
        expirationTime,
      )
      <span class="hljs-keyword">if</span> (!newFiber) {
        <span class="hljs-keyword">continue</span>
      }
      lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx)
      <span class="hljs-keyword">if</span> (previousNewFiber === <span class="hljs-literal">null</span>) {
        resultingFirstChild = newFiber
      } <span class="hljs-keyword">else</span> {
        previousNewFiber.sibling = newFiber
      }
      previousNewFiber = newFiber
    }
    <span class="hljs-keyword">return</span> resultingFirstChild
  }

  <span class="hljs-comment">// Add all children to a key map for quick lookups.</span>
  <span class="hljs-keyword">const</span> existingChildren = mapRemainingChildren(returnFiber, oldFiber)

  <span class="hljs-comment">// Keep scanning and use the map to restore deleted items as moves.</span>
  <span class="hljs-keyword">for</span> (; newIdx &lt; newChildren.length; newIdx++) {
    <span class="hljs-keyword">const</span> newFiber = updateFromMap(
      existingChildren,
      returnFiber,
      newIdx,
      newChildren[newIdx],
      expirationTime,
    )
    <span class="hljs-keyword">if</span> (newFiber) {
      <span class="hljs-keyword">if</span> (shouldTrackSideEffects) {
        <span class="hljs-keyword">if</span> (newFiber.alternate !== <span class="hljs-literal">null</span>) {
          existingChildren.delete(newFiber.key === <span class="hljs-literal">null</span> ? newIdx : newFiber.key)
        }
      }
      lastPlacedIndex = placeChild(newFiber, lastPlacedIndex, newIdx)
      <span class="hljs-keyword">if</span> (previousNewFiber === <span class="hljs-literal">null</span>) {
        resultingFirstChild = newFiber
      } <span class="hljs-keyword">else</span> {
        previousNewFiber.sibling = newFiber
      }
      previousNewFiber = newFiber
    }
  }

  <span class="hljs-keyword">if</span> (shouldTrackSideEffects) {
    existingChildren.forEach(child =&gt; deleteChild(returnFiber, child))
  }

  <span class="hljs-keyword">return</span> resultingFirstChild
}</code></pre>
</div></div></div>



<div class="api-method"><div class="api-method-definition"><h1 id="updateslot">updateSlot</h1><p>&#x5982;&#x679C;&#x662F;&#x6587;&#x5B57;&#x8282;&#x70B9;&#x5C31;&#x6CA1;&#x5565;&#x597D;&#x8BF4;&#x7684;&#xFF0C;&#x6BD5;&#x7ADF;&#x6587;&#x5B57;&#x8282;&#x70B9;&#x4E0D;&#x5B58;&#x5728;<code>key</code></p><p>&#x5982;&#x679C;&#x662F;&#x5BF9;&#x8C61;&#xFF0C;&#x5C31;&#x662F;&#x6839;&#x636E;&#x4E0D;&#x540C;&#x7684;&#x7C7B;&#x578B;&#x6267;&#x884C;&#x4E0D;&#x540C;&#x7684;<code>update</code></p><p>&#x5982;&#x679C;&#x662F;&#x6570;&#x7EC4;&#xFF0C;&#x5219;&#x4F5C;&#x4E3A;<code>fragment</code>&#x6765;&#x5904;&#x7406;</p></div><div class="api-method-code"><div class="api-method-sample" data-lang="js" data-name="JavaScript"><pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">updateSlot</span>(<span class="hljs-params">
  returnFiber: Fiber,
  oldFiber: Fiber | null,
  newChild: any,
  expirationTime: ExpirationTime,
</span>): <span class="hljs-title">Fiber</span> | <span class="hljs-title">null</span> </span>{
  <span class="hljs-comment">// Update the fiber if the keys match, otherwise return null.</span>

  <span class="hljs-keyword">const</span> key = oldFiber !== <span class="hljs-literal">null</span> ? oldFiber.key : <span class="hljs-literal">null</span>

  <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> newChild === <span class="hljs-string">&apos;string&apos;</span> || <span class="hljs-keyword">typeof</span> newChild === <span class="hljs-string">&apos;number&apos;</span>) {
    <span class="hljs-comment">// Text nodes don&apos;t have keys. If the previous node is implicitly keyed</span>
    <span class="hljs-comment">// we can continue to replace it without aborting even if it is not a text</span>
    <span class="hljs-comment">// node.</span>
    <span class="hljs-keyword">if</span> (key !== <span class="hljs-literal">null</span>) {
      <span class="hljs-keyword">return</span> <span class="hljs-literal">null</span>
    }
    <span class="hljs-keyword">return</span> updateTextNode(returnFiber, oldFiber, <span class="hljs-string">&apos;&apos;</span> + newChild, expirationTime)
  }

  <span class="hljs-keyword">if</span> (<span class="hljs-keyword">typeof</span> newChild === <span class="hljs-string">&apos;object&apos;</span> &amp;&amp; newChild !== <span class="hljs-literal">null</span>) {
    <span class="hljs-keyword">switch</span> (newChild.$$<span class="hljs-keyword">typeof</span>) {
      <span class="hljs-keyword">case</span> REACT_ELEMENT_TYPE: {
        <span class="hljs-keyword">if</span> (newChild.key === key) {
          <span class="hljs-keyword">if</span> (newChild.type === REACT_FRAGMENT_TYPE) {
            <span class="hljs-keyword">return</span> updateFragment(
              returnFiber,
              oldFiber,
              newChild.props.children,
              expirationTime,
              key,
            )
          }
          <span class="hljs-keyword">return</span> updateElement(returnFiber, oldFiber, newChild, expirationTime)
        } <span class="hljs-keyword">else</span> {
          <span class="hljs-keyword">return</span> <span class="hljs-literal">null</span>
        }
      }
      <span class="hljs-keyword">case</span> REACT_PORTAL_TYPE: {
        <span class="hljs-keyword">if</span> (newChild.key === key) {
          <span class="hljs-keyword">return</span> updatePortal(returnFiber, oldFiber, newChild, expirationTime)
        } <span class="hljs-keyword">else</span> {
          <span class="hljs-keyword">return</span> <span class="hljs-literal">null</span>
        }
      }
    }

    <span class="hljs-keyword">if</span> (isArray(newChild) || getIteratorFn(newChild)) {
      <span class="hljs-keyword">if</span> (key !== <span class="hljs-literal">null</span>) {
        <span class="hljs-keyword">return</span> <span class="hljs-literal">null</span>
      }

      <span class="hljs-keyword">return</span> updateFragment(
        returnFiber,
        oldFiber,
        newChild,
        expirationTime,
        <span class="hljs-literal">null</span>,
      )
    }

    throwOnInvalidObjectType(returnFiber, newChild)
  }

  <span class="hljs-keyword">return</span> <span class="hljs-literal">null</span>
}</code></pre>
</div></div></div>




                                
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